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|Ab urbe condita||2104|
|Balinese saka calendar||1272–1273|
|English Regnal year||24 Edw. 3 – 25 Edw. 3|
|Chinese calendar||庚寅年 (Metal Tiger)|
4047 or 3987
— to —
辛卯年 (Metal Rabbit)
4048 or 3988
|- Vikram Samvat||1407–1408|
|- Shaka Samvat||1272–1273|
|- Kali Yuga||4451–4452|
|Japanese calendar||Kannō 2|
|Minguo calendar||561 before ROC|
|Thai solar calendar||1893–1894|
1477 or 1096 or 324
— to —
1478 or 1097 or 325
|Wikimedia Commons has media related to 1351.|
- January 14 – Edward III of England institutes the Treason Act of 1351, defining treason in English law. It is currently one of the earliest statues still in force under English law.
- March 26 – War of the Breton Succession – Combat of the Thirty: Thirty chosen knights each, from the Kingdoms of France and England, fight to determine who will rule the Duchy of Brittany; a Franco-Breton victory is assured by the squire Guillaume de Montauban.
- April 8 – Hundred Years' War: At the Battle of Taillebourg the French are defeated by the English.
- May 1 – Zürich joins the Swiss Confederation.
- King Ramathibodi I ascends the throne in Ayutthaya (now Thailand). He begins to propagate Theravada Buddhism as the state religion.
- King Gongmin ascends the throne in Goryeo.
- Emperor Go-Kōgon of Japan succeeds Emperor Sukō, making them the third and fourth of the Northern Ashikaga Pretenders, respectively.
- The Statute of Laborers is enacted by the Parliament of England, to deal with a labor shortage caused by the Black Death.
- Vantaa, Finland is first mentioned.
- Firuz Tughlaq succeeds Mohammad Tughlaq, as Sultan of Delhi.
- The Mongolian-run Yuan dynasty of China is permanently weakened by an uprising, known as the Red Turban Rebellion.
- The Samma Dynasty in Sindh (now part of Pakistan) breaks away from the Delhi Sultanate.
- The Turks cross the Dardanelles into Europe for the first time.
- February 13 – Kō no Morofuyu, Japanese general
- March 20 – Muhammad bin Tughluq, Sultan of Delhi
- March 25
- May 24 – Abu al-Hasan Ali ibn Othman, Sultan of Morocco (b. 1297)
- June 20 – Margareta Ebner, German nun (b. 1291)
- November 15 – Joanna of Pfirt, duchess consort of Austria